单选题
Discoveries in genetics, molecular biology and genomics—all of ______ provide significant benefits for human health—would not be possible without the underlying knowledge of evolution.
【正确答案】
C
【答案解析】[解析] 本题空格处指代的是前面的名词“Discoveries in genetics，molecular biology and genomics”，属于“介词+关系代词”引导的非限定性定语从句形式。在非限定性定语从句中，关系词不能用that和those。因此C项正确。